// Copyright (c) 2008-2010, Arne Claus
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the 
// following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice, this list of conditions and the following 
//   disclaimer.
// - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following 
//   disclaimer in the documentation and/or other materials provided with the distribution.
// - Neither the name Arne Claus nor the names of any contributors may be used to endorse or promote products
//   derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef __INCLUDED_CBL_THREAD_POOL_H__
#define __INCLUDED_CBL_THREAD_POOL_H__

#include "CBL_Thread.h"
#include "CBL_Singleton.h"
#include "CBL_Delegate.h"
#include <list>

CB_SUBNAMESPACE_START(Cpu)

class CThreadPool : public CThread, public CSingleton<CThreadPool>
{
public:

	//! \brief  Adds a new job to the queue.
    //! \detail Jobs will be processed FIFO by n threads, where n is the number returned
    //!			by CPU::GetTotalNumberOfProcessors()
	BASELIB_API void PushJob(CDelegate& _rJob);
    
    //! \brief  Forces the Pool to finish all running jobs.
    //! \detail PushJob is blocked while draining.
    BASELIB_API void Drain();
    
protected:

	class CJobProcess : public CThread
    {
	public:
		CJobProcess() : CThread("Job", 10), m_Working(false) {}

		void AssignJob(CDelegate& _rJob);
		bool IsAvailable();

    protected:
    	virtual void Tick(void* _pData);
		
		CDelegate m_Job;
		bool	  m_Working;
		CMutex    m_WorkMutex;
    };
    
	virtual void Tick(void* _pData);
	
private:

    CBL_SINGLETON_PRIVATE(CThreadPool);
	
	BASELIB_API CThreadPool();
	BASELIB_API virtual ~CThreadPool();
    
    CThreadPool(const CThreadPool&);				// forbidden
    CThreadPool& operator = (const CThreadPool&);	// forbidden
	
private:

	std::list<CDelegate> m_JobQueue;
    
	CMutex	     m_QueueMutex;
    CMutex	     m_DrainMutex;
    
    uint32		 m_PoolSize;
	CJobProcess* m_pThreadPool;
};

CB_SUBNAMESPACE_END

#endif